RHCE7 Learning Notes 28--control services and processes

First, RHEL6 and RHEL7 service control methods are different

RHEL6 in use: Service XXX start|stop|restart|reload

Used in RHEL7: Systemctl start|stop|restart|reload XXXX

Second, view system services

To view the suffix in the system for service services:

[Email protected] ~]# Systemctl list-unit-files--type=service

The service set with the suffix target, which contains the service suffix, is understood as the RunLevel in RHEL6:

[Email protected] ~]# Systemctl list-unit-files--type=target

RHEL6 the operating level inside, the RunLevel includes services that specify whether the service starts and starts the sequence:

0 1 2 3 4 5 6

Shutdown single user multi-user not using graphical interface restart

To view the operating level of the RHEL7:

[[email protected] ~]# RunLevel N 5

The target for RHEL7 is the service set, which includes services that are suffixed with service:

A.target:a.service,b.service,c.service,d.service

B.target:a.service,b.serice,c.service,d.serice

View and set RHEL7 default run target:

[Email protected] ~]# Systemctl get-default graphical.target

[Email protected] ~]# Systemctl set-default multi-user.target

The target in RHEL7 is compared to the operating level of RHEL6:

RHEL6 RHEL7

0 Runlevel0 Poweroff.target

1 Runlevel1 Rescuse.target

2 Runlevel2 Multi-user.target

3 Runlevel3 Multi-user.target

4 Runlevel4 Multi-user.target

5 Runlevel5 Graphical.target

6 Runlevel6 Reboot.target

To switch the run level:

[Email protected] ~]# Systemctl isolate Graphical.target

Emergency.target Graphical.target Multi-user.target Rescue.target

In RHEL7, you can allow multiple terminals to open a graphical interface, while only 1 graphical interfaces are allowed to run in RHEL6.

This article is from the "Ordinary Road" blog, please be sure to keep this source http://linjohn.blog.51cto.com/1026193/1611000

RHCE7 Learning Notes 28--control services and processes